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You are watching: 2000 bmw 323i o2 sensor location


266k miles. Ns am trying to figure out what is wrong through the Catalytic Converter/O2 Sensor mechanism on mine e46.While driving, mine sensor 1 financial institution 2 (post cat exhaust line because that cylinder 123) and also sensor 2 financial institution 2 (post cat exhaust line because that cylinder 456) O2 sensors space at .75V and also .1V respectively flat line, after ~ hot, driving on the freeway at stable 55mph. No fluctuations uneven I change the throttle. They likewise do the same level line, ~ hot, as soon as at idle.low volts mean more oxygen in the exhaust right? and high volts typical low oxygen? or the O2 sensors room bad?thanks for any help
Post-cat O2 senors have to read 0.6 to 0.8 volt stable at steady speed driving and idle if catalytic converter is working correctly.At 266k miles, lock are means overdue because that replacement.I introduce Bosch straight fit sensors.Usually Amazon has actually the ideal price.
And a continuous low reading of .1V (in the cylinder 456 line) at constant speed could additionally be a leak in the exhaust? i mean, a poor catalyst converter wouldn"t do that right? a poor Cat wouldn"t give a stable reading of .1V post cat right? say thanks to you for the help
And a consistent low analysis of .1V (in the cylinder 456 line) at constant speed could likewise be a leak in the exhaust? ns mean, a bad catalyst converter wouldn"t execute that right? a bad Cat wouldn"t offer a stable analysis of .1V short article cat right? say thanks to you for the help
Good suggest on leak in exhaust leading to low voltage. However you might hear those leak.What is story on your BMW? do you think those O2 sensors space original?
I have actually records ago to 2003 (its 2000). It to be my dad"s so I think i have all the records for it, and I didn"t uncover an O2 instead of in the records, but reasonably recently (08/2012) it was provided in a work record the the mechanic confirm the O2 sensors and also tested fine. Therefore i would bet these space the originals. So if one might hear an exhaust line cyl. 456 leak, deserve to i simply turn the on and also put my head under the car and also hear a noise? any certain noise to hear for?If it no a leak, is the a normal sign of a failing sensor because that it to be secure at 0.1V at constant speed/idle, yet able to fluctuate once the accelerator is altered? i haven"t studied many cars in your failing sensors to know the nicks and also crannies of it all
I was simply watching a video clip on O2 diagnosis, and also it claimed a short signal might be a vacuum leak. Hmm. I understand from the job-related records there have been regular vacuum leak inspections and also replacements....
What sort of tool space you using to screen the O2 sensor voltage?What specific problem do you have? do you have actually a cat efficiency fault code or cat monitor no set?Long and also short hatchet fuel trims will reflect vacuum leak.Engine manage module (DME) will adapt to certain level the vacuum leak, and post-cat O2 sensor will act normally.If you have an Android phone, OBD fusion or speak pro through a bluetooth OBD scanner will assist you monitor health of engine operation.Small exhaust leak will certainly make ticking sound
I have actually android and also torque app.cat not set "incomplete" ns cleared the codes also soon before smog time.fuel trim, going to look that up
Do girlfriend have any other fault code?Learn exactly how to log in data utilizing torque agree and try to mimic this chart: first cold start in the morning to monitor procedure of O2 sensors.

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Also log in data when driving 60 mph steady and at idle. Take date while engine coolant temperature is above 90 deg C.
ok so i did the live graph with fuel trim ST 1 and 2 and also LT 1 and 2 (above 90C)Long ax FT is 1.6 for bank 1 -1.6 for bank 2Short term FT dithers approximately 3 come 6 for bank 1Short ax FT dithers about -3 come -5 for financial institution 2now financial institution 2 is the cylinders 456 which has actually the short article cat o2 sensor consistently at 0.1v or lower both in ~ 55mph and also idle (while financial institution 1 Cyl 123 short article cat O2 is repeatedly at 0.75V)
I imply you have actually the intake exhilaration tested because that vacuum leaks. The car is now 16+ year old and the rubber hoses and plugs in the intake room literally rotting. Also, the valve cover can have minute cracks. A smoke check is the only way to uncover all vacuum leaks. I"d replace the short article cat O2 sensors just because they room old. Old sensors create inaccurate data, therefore causing the ECU come improperly manage the engine"s performance. Through the exhaust cold soak the sensors with a a penetrating fluid. I choose Kano Aero fluid. Allow the car sit overnight. You might need to usage a torch to totally free them. Once they"re out provide them a respectable funeral as castle done their job!!But first, smoke test the intake!
I indicate you have the intake smoke tested because that vacuum leaks. The automobile is now 16+ years old and the rubber hoses and also plugs in the intake are literally rotting. Also, the valve cover could have minute cracks. A smoke test is the only way to find all vacuum leaks.I"d change the short article cat O2 sensors just since they space old. Old sensors produce inaccurate data, therefore causing the ECU to improperly manage the engine"s performance. With the exhaust cold soak the sensors with a a penetrating fluid. I choose Kano Aero fluid. Allow the auto sit overnight. You might need to usage a torch to complimentary them. When they"re out give them a respectable funeral as castle done your job!!But first, smoke check the intake!
So I changed the VCG and put 4 new OE Bosch O2 sensors and 6 new spark plugs. I likewise put a quart of marvel secret oil in the gas tank come try.I don"t watch a change in the O2 financial institution 2 short article cat sensor yet. Drove that 50+ miles. It"s still analysis 0.1 volts steady at constant speed.question: would certainly a leaky VCG reason a article cat financial institution 2 O2 sensor to check out 0.1 v?Also: would a leaky vacuum hose cause only bank 2 post cat to review 0.1v? would a leaky input manifold gasket at bank 2 reason this? How around a leaky throttle body gasket?Pre cat financial institution 2 o2 voltage dither appears sort the normal... Yet it appears not as good as financial institution 1 Pre cat O2 voltage ditherWould a leaky exhaust manifold gasket financial institution 2 cause this? ...an flow of O2 near the article cat sensor?Thanks
I was watching a video clip on negative fuel trims instance study because that e46, and also the male said a an adverse fuel trim because that only one of the banks method a leaky fuel injector. Does anyone confirm this? I likewise read ~ above Bav Auto blog that a vacuum leak top top the financial institution 2 side of the input manifold could also cause only bank 2 to have actually a an unfavorable fuel trim. Thanks for any help
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